Mahabharata 15.28.11

परं निर्वेदमगमंश्चिन्तयन्तो नराधिपम्तच्च ज्ञातिवधं घोरं संस्मरन्तः पुनः पुनः

paraṃ nirvedamagamaṃścintayanto narādhipamtacca jñātivadhaṃ ghoraṃ saṃsmarantaḥ punaḥ punaḥ

Our plain-language meaning of this verse is waiting for scholar review.